They are legal at most Chunk Gun matches. I have a Merit disc that you can dial the hole size, it does work. I also made
some out of black plastic tape. To get a nice clean hole in it, take a small finishing nail, cut it off and file a clean, flat end
on it. Cut a small round piece of plastic tape and place it on a smooth piece of maple, or any hardwood. Then place that
flat ended nail where you want the hole and smack it with a hammer, this will give you a nice, clean hole.......Don